CN101266399A - Integral back projection type display screen and its manufacture method - Google Patents
Integral back projection type display screen and its manufacture method Download PDFInfo
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- CN101266399A CN101266399A CN 200710087051 CN200710087051A CN101266399A CN 101266399 A CN101266399 A CN 101266399A CN 200710087051 CN200710087051 CN 200710087051 CN 200710087051 A CN200710087051 A CN 200710087051A CN 101266399 A CN101266399 A CN 101266399A
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Abstract
The invention relates to a monolithic rear-projection screen and producing method thereof. The rear-projection screen is composed of the following components: a Fresnel lens component, having a plurality of trapezium circular rings for focussing lights into parallel lights; and a light scattering part connected with the Fresnel lens component as an integral. The Fresnel lens component and the light scattering part are formed by a same colophony combination, which is principally composed of a colophony material for forming a transparent substrate for accommodating nano functional material; a nano functional material, whose particle diameter is smaller than 100nm, and whose dosage is 0.2-10% of the weight of the colophony material; a nano-scale contrast control material, which is chosen form a group composed of high colour nano inorganic colors and high colour organic dye, whose particle diameter is smaller than 100nm, and whose dosage is 0.003-0.01% of the weight of the colophony material. Because the Fresnel lens component and the light scattering part are integral molding, preparing technic of the screen can be simplified and the screen can be improved.
Description
Technical field
The present invention relates to rear projection screen and preparation method thereof, relate in particular to integral back projection type screen and preparation method thereof.
Background technology
The large screen back projection display technique is expansion rapidly, application mainly comprises: the monitoring of academic exchange, long-distance education, industry, traffic, railway, shipping, aviation, public security and commander, video display projection, live broadcast, advertisement, science and technology, cultural information issue and reception, all size type military exercises simulated field training etc.Giant-screen, screen splicing wall and super large rear-projection display screen curtain have very big application space.Projection screen is divided into front projection type display screen and rear-projection display screen curtain.Front projection type display screen (abbreviation front projection screen) is the screen that spectators and projector are in homonymy, its scatterer that utilizes screen surface with light to around scattering.Front projection screen brightness is low, and contrast is little, and is subject to the influence of ambient light, only is adapted at dark indoor watching, and because spectators and projector are in the homonymy of screen, if there is the people to explain at screen front, will hinder drop shadow effect.Rear-projection display screen curtain (abbreviation rear projection screen) is a kind of transmissive viewing screen, and spectators and projector are in the both sides of screen, and display effect is greatly improved, so the demand of rear-projection display screen curtain increases day by day.
Rear projection screen is designed to the image that projects the screen back side is injected observation space usually.The observation space of projection system is big (rear-projection simulation trainer) or quite little (as the rear-projection data monitor) quite.The performance of rear projection screen can be described with various screen characteristics, generally comprises undesirable artefacts such as color spot of gain, visual angle, resolution, contrast, existence etc.Wish that generally rear projection screen has high resolving power, high-contrast and big gain, wishes that also screen can scatter light in big observation space.Unfortunately, after a screen improved properties, one or more other screen characteristics tend to become bad.For example, in order to improve the screen gain, just must reduce to be convenient to watch the visual angle of screen.As a result, in order to make the specific back projector display device screen of acceptable performance generally, do that some are compromise at screen characteristic and aspect of performance.Therefore, screen is proposed a requirement, promptly in the required minimum performance standards of the back projector display device that satisfies this screen of use, required overall performance that raising is arranged.
Various types of rear projection screens are provided in the prior art, for example frosted glass formula rear projection screen, Fresnel lens type rear projection screen, microbead type back projection screen etc.
Low, the poor definition of brightness of frosted glass formula rear projection screen.Little different type rear projection screen just sees the document record as far back as the eighties of last century initial stage forties, United States Patent (USP) U52 for example, a kind of printing opacity screen or rear projection screen have been narrated in 378,252 Shens, and this screen comprises monofilm layer extinction rete, a plurality of refractive power spherula on printing opacity supporting mass, side of supporting mass.Used refractive power spherula be glass pellet body, natural resin spherula or synthetic resin (for example polymethylmethacrylate) spherula as light transmissive material, spherular diameter is different because of the size of screen itself, generally at 3um between a few mm scopes.This screen not only can use under dark surrounds, and can use under bright light environments.But, under the bright conditions, projection light source intensity must be than strong 20 times under the dark condition.Recent decades, for various reasons, with high costs due to the residing state of the art of for example little different production method, the structure of microbead type back projection screen and some technological difficulties of manufacture method aspect fail to satisfactorily resolve or the like, make it to fail to be used widely.
U.S. Pat 6,204.971 in put down in writing a kind of rear projection screen, this screen is three film layer structures, be dianegative, opaque bonding rete and be embedded in glass microballoon individual particle layer in the opaque bonding rete, wherein used microballon is the simple glass microballon, and its refractive index is not more than 1.70 (1.5-1.7).Because the refractive index of used microballon is little, cause the rear projection screen gain that makes low, the brightness and the sharpness of image all have much room for improvement.The rear projection screen of the trilamellar membrane structure of putting down in writing among the Chinese patent CN1428649A, though improve at aspects such as microballon refractive indexes, performance increases, but production technology is still very complicated, the particle size of microballon is still very big, makes thicknesses of layers also bigger, influences the sharpness of screen.
Rear projection screen among the CN 1592868 of U.S. Roehm GmbH application also is by the refraction principle preparation of spherical plastic particles, because the particle diameter of spherical plastic particles is bigger, therefore coating is thicker, can influence gain and sharpness, therefore can not provide very desirable image.
Disclosed a kind of photoimaging functional membrane among the Chinese patent application publication number CN1641478A, make by the material of main part of weight ratio 65-98%, the nanoparticle of 1-20% and the auxiliary agent of 1-30%, described material of main part comprises tygon, Polyvinylchloride, polypropylene, polyacrylate, polyamide, polyimide and polyurethane, and nanoparticle is TiO2, TiO2/SiO2, iron oxide, mica, TiO2/ mica, aluminium silver powder etc.Disclosed a kind of nano projection display screen material among the Chinese patent application publication number CN1392163A.But, neither good unification or the balance that can accomplish contrast, brightness and sharpness of these screens, still too late Fresnel lens type screen on display effect.And these rear projection screens of the prior art need substrate usually, and for example plastic base or glass substrate form light transmissive films by the method that applies on substrate.The defective that adopts this technology to exist is to be difficult to form uniform film, and the thinner thickness of film and damaging easily, and is subjected to the restriction of substrate.
The Fresnel lens type rear projection screen generally comprises Fresnel Lenses, cylindrical mirror and light scattering layer.Though Fresnel lens type rear projection screen effect is than frosted glass formula rear projection screen brightness height, sharpness increases, but because the requirement on machining accuracy of Fresenl mirror and cylindrical mirror is very high, so cost is very high, and the screen that is made into oversize is very difficult, does not satisfy growing demand.Chinese patent CN 2313233Y provides a kind of rear projection screen by mold heated pressure forming Fresnel transmission form plate face and semi-cylindrical part, and the diffusion photosphere (light scattering layer) of one deck diffuse reflection extinction wherein is set on the semi-cylindrical side partly in the face of spectators.And because structures such as cylinder have specific directivity to light.Make the light that projects on the screen be refracted or reflex to different angles, therefore, make the light intensity of vertical direction and horizontal direction inhomogeneous.It is a kind of by mold heated pressure forming plane curtain base substrate and lira scatter plate face that Chinese patent CN 2313233Y also provides, by one side of spectators' imaging being provided with the diffusion photosphere of one deck high density diffuse reflection extinction at real estate, the processing technology of this technology is relative complex still, and has the uneven problem of diffusion photosphere.If the diffusion photosphere damages, then this rear projection screen just can't use.
Therefore, need a kind of structure and production technology simpler, have more high mechanical properties and a high-quality rear projection screen that do not have light scattering layer.
Summary of the invention
In order to solve prior art problems, the invention provides a kind ofly by the one-time formed integral back projection type screen of casting mode, this screen comprises a Fresnel Lenses part.
The invention provides a kind of integral back projection type screen, by forming with lower member: the Fresnel Lenses part, have a plurality of trapezoidal annulus, be used for light is pooled directional light, described trapezoidal annulus is arranged on light source one side; The light scattering part partly is connected in aggregatesly with described Fresnel Lenses, and described light scattering partly has one and is arranged on towards the plane of spectators' one side; Wherein said Fresnel Lenses part is formed by identical resin combination with the light scattering part, and described composition mainly is made of following composition: resin material is used to form the matrix that nano-functional material is held in transparent also conduct; Nano-functional material, particle diameter are less than 100 nanometers, and consumption is the 0.2-10% of resin material weight; Nanoscale contrast adjustment material, it is selected from the group that is made of dark nano inorganic pigment and dark organic dyestuff, and particle diameter is less than 100 nanometers, and consumption is the 0.03-0.1 ‰ of resin material weight.
According to rear projection screen of the present invention, wherein said resin material is selected from the group of being made up of tygon, polypropylene, Polyvinylchloride, polystyrene, polyalkenylalcohols, poly-(methyl) acrylate, polyamide, polyimide, polyvinyl butyral.
According to rear projection screen of the present invention, wherein said nano-functional material is selected from the group that is made of silicon-base oxide, aluminium oxide, zirconia, lanthana, titanium dioxide, cerium oxide, tungsten oxide, tantalum oxide, baryta, barium sulphate, yttria or its potpourri.
According to rear projection screen of the present invention, the group that wherein said contrast adjustment material is selected from is black, Prussian blue by nickel oxide, chrome black, iron oxide black, cobalt black, graphite, carbon black, black micaceous iron-ore, nigrosine, anthraquinone, ultramarine blue, cobalt blue, copper phthalein indigo plant and indanthrone constitute.
According to rear projection screen of the present invention, wherein said Fresnel Lenses part and light scattering partly form simultaneously by casting or injection technique.
According to rear projection screen of the present invention, wherein said screen comprises that also a protection panel (30) and the plane towards spectators' one side (21) of described light scattering part (20) link together.
The present invention also provides a kind of method of producing the integral back projection type screen by the casting mode, may further comprise the steps:
1) be provided for forming the composition of monoblock type individual layer rear projection screen by casting, said composition comprises: resin material, and as the matrix that is used to hold nano-functional material, described resin material is liquid before curing; Nano-functional material, particle diameter are in the scope of 1-100nm, and consumption is the 0.2-10% of resin material weight; Nano inorganic pigment or organic dyestuff, it is selected from the group that is made of dark nano inorganic pigment and dark organic pigment or dyestuff, and particle diameter is less than 100 nanometers, and consumption is the 0.03-0.1 ‰ of resin material weight;
2) provide first template and second template to make mould, described first template has writing board shape, and described second template has the depressed part of Fresnel Lenses shape;
3) submarginal part is provided with sept and combination between described first template and second template, carries out at least three face seals with encapsulant, forms the mould with the cavity that is used to hold composition;
4) described composition is injected in the described mould;
5) solidify described composition, remove mould, obtain the integral back projection type screen.
The method according to this invention, wherein said first template and second template are selected from glass, metal, plastics, timber or stupalith.
The method according to this invention, described first template and the airtight combination of second template are provided with the composition inlet in the described mould.
The method according to this invention also is included in and injects before the composition step that described first template and/or second template are handled with release agent.
The method according to this invention can also be included in the step that vacuumizes before composition injects, so that remove the bubble in the composition fully.
The method according to this invention when injecting composition, makes composition flow down along the side of template, forms bubble to avoid bringing air into.
The method according to this invention adopts heat curing or radiation curing during curable resin composition.
The method according to this invention, wherein, the inside surface of described first template or outside surface are through inferior optical processing.
The method according to this invention wherein, when removing mould, is removed described second template, sept and encapsulant, and is made described first template and described rear projection screen keep being connected, and described first template becomes the protection panel of described rear projection screen.
The present invention also provides a kind of back projection type optical projection system, and it comprises the integral back projection type screen that projector and the method according to this invention are made.
The present invention also provides a kind of mould that is used for producing by the casting mode integral back projection type screen, comprise first template and second template, described first template has writing board shape, described second template has the depressed part of Fresnel Lenses shape, described depressed part has a plurality of trapezoidal annulus, by shape sept parting seal, form a cavity between the edge of described first template and second template.
Individual layer casting type nanometer rear projection screen provided by the present invention has the soft naturally excellent results of high visual angle, high-contrast, color.Resolution is right greater than 30 lines according to surveying and determination, and contrast is 500: 1, gains to be 0.5-2.5, and angle of visibility is greater than 160 degree, and color is soft naturally not dazzling.
Rear projection screen according to the present invention has enough mechanical stabilities, and the articles for washing that screen surface can be general cleans.
Rear projection screen according to the present invention has hi-vision stability, the information that spectators can observation post presents in long-time and be difficult for generation visual fatigue.
Composition according to the present invention can improve the stability of degree of scatter and composition through the sand milling dispersion treatment.Because Fresnel Lenses part and light scattering part global formation make the manufacture craft of screen simplify the brightness that also can improve screen.
Description of drawings
Fig. 1 is the front schematic perspective view according to the rear projection screen of the first embodiment of the present invention.
Fig. 2 is the back side schematic perspective view according to the rear projection screen of the first embodiment of the present invention.
Fig. 3 is the front schematic perspective view of rear projection screen according to another embodiment of the present invention.
Embodiment
According to a first aspect of the invention, provide a kind of integral back projection type screen, as depicted in figs. 1 and 2.This rear projection screen 1 is by forming with lower member: Fresnel Lenses part 10, have a plurality of trapezoidal annulus 11, and be used for light is pooled directional light, described trapezoidal annulus is arranged on light source one side; Light scattering part 20 forms an integral body with described Fresnel Lenses part 10, and described light scattering partly has one and is arranged on towards the plane 21 of spectators' one side; Wherein said Fresnel Lenses part is formed by identical resin combination with the light scattering part, and described composition mainly is made of following composition: resin material is used to form the matrix that nano-functional material is held in transparent also conduct; Nano-functional material, particle diameter are less than 100nm, and consumption is the 0.2-10% of resin material weight; The contrast adjustment material, it is selected from the group that is made of dark nano inorganic pigment and dark organic pigment and dyestuff, and particle diameter is less than 100 nanometers, and consumption is the 0.03-0.1 ‰ of resin material weight.
According to integral back projection type screen of the present invention, owing to adopt casting molding process, Fresnel Lenses part and light scattering part global formation, because having the nano-functional material of light scattering effect is evenly distributed in the resin matrix, so Fresnel Lenses part and light scattering part all have the effect of light scattering, therefore do not need as CN 2313233Y, to be provided with in addition light scattering layer or diffusion photosphere, and do not need cylindrical mirror.That is to say that the Fresnel Lenses part also has the effect of light scattering except having the effect of converging light, this part is owing to have the structure of Fresnel Lenses certainly, and it is to converge the master that act as of light.The thickness of Fresnel Lenses part and light scattering part can be adjusted as required.The trapezoidal annulus of Fresnel Lenses part is the lira form, and the lira spacing is about 0.015mm to 0.8mm, and the lira groove depth is approximately 0.15mm to 0.25mm, and this lira spacing and groove depth can be adjusted according to the precision of size, performance requirement and the template of screen.
In another embodiment of the present invention, provide a kind of rear projection screen, as shown in Figure 3 with protection panel 30.Described protection panel 30 links together with the plane 21 towards spectators' one side of described light scattering part 20.This protection panel 30 can be formed by a transparent template.
The kind that is used for resin material of the present invention does not have strict restriction.In general, have that the macromolecular material of transparency preferably can be suitable for.Because the present invention adopts the moulding process of casting, used resin material should be the liquid with better flowability before curing, be applicable to that resin material of the present invention comprises heat reactive resin and light-cured resin, can be monomer or oligomer before solidifying.The example that is applicable to the monomer of heat reactive resin or oligomer includes but not limited to polyolefins such as tygon, polypropylene.Polyvinylchloride, polystyrene etc.; Polyene alcohols such as polyvinyl alcohol (PVA), POLYPROPYLENE GLYCOL etc.; Polyacrylate is as (methyl) polymethyl acrylate, (methyl) polyethyl acrylate; Polyamide-based; Polyimides; Zapon and polyvinyl butyral, wherein preferably polyethylene butyral.In this case, preferably add the initiating agent of usual amounts, for example benzophenone, ammonium persulfate, azoisobutyronitrile or the like.In addition, use proper amount of solvent or thinning agent alternatively, these solvents or thinning agent can be alkane such as hexane, heptane, naphthenic hydrocarbon such as cyclohexane, aromatic hydrocarbons such as benzene, toluene, ethylbenzene, lower alcohol such as ethanol, propyl alcohol, low-carbon carboxylate such as ethyl acetate, butyl acetate, ethyl butyrate or its potpourri.Because the present invention adopts the forming method of casting, does not preferably use or use less solvent or thinning agent.
Light-cured resin generally includes polymerisable monomer or oligomer, and optionally an amount of thinning agent comprises reactive diluent and non-activated thinner and an amount of initiating agent.So-called reactive diluent is meant that it participates in polymerization at solidification process, and non-activated thinner is meant and does not participate in reaction and only play diluting effect in solidification process.The example of oligomer that is applicable to the light-cured resin of the object of the invention includes but not limited to: acryl resin or methacrylic resin; Unsaturated polyester (UP), as dibasic alcohol (ethylene glycol, multicondensed ethylene glycol, propylene glycol, polypropylene glycol, 1, the 4-butylene glycol) with the multipolymer of unsaturated dicarboxylic acid (in Malaysia carboxylic acid, maleic anhydride, the fumaric acid at least a), in this case, preferably add some saturated carboxylic acids as () phthalic acid, succinic acid, hexane diacid, azelaic acid be as the soft readjustment agent; Epoxy acrylate is as bisphenol A epoxy acrylate, phenolic aldehyde epoxy acrylate, amine modified epoxy acrylic ester, phosphoric acid (ester) modified epoxy acrylic ester, halogenated epoxy acrylate, long-chain fatty acid modified epoxy acrylic ester, silicone-modified epoxy acrylate, epoxidized oil acrylate; Urethane acrylate, as the oligomer, 1 of oligomer, isophorone diisocyanate and the polypropylene glycol of isophorone diisocyanate and polyglycol, the oligomer of 4-dicyclohexyl methyl hydride diisocyanate and poly-(1, the 4-butylene glycol); Polyester acrylate, as succinic acid-ethylene glycol-acrylate copolymer, hexane diacid-propylene glycol-methacrylate copolymer; Polyether acrylate is as many ethoxylations tri methylol triacrylate; The acroleic acid esterification polyacrylic resin; Epoxy resin, as bisphenol A epoxide resin, novalac epoxy, the PTMEG glycidol ether; The light-solidifying poly siloxane, as the acroleic acid esterification polysiloxane, epoxy-functional polysiloxane etc.Preferred epoxy acrylate, polyester acrylate, Polyurethane acrylate, epoxidized oil acrylate, long-chain fatty acid modified acroleic acid esterification resin.
The example that is applicable to the initiating agent of the object of the invention light-cured resin includes but not limited to: (as α, alpha, alpha-dimethyl oxygen base-α-phenyl acetophenone (DMPA), dialkoxy acetophenone, alpha-hydroxyalkyl benzophenone, α-amine alkyl phenones are (as 2-methyl isophthalic acid-[4-first sulfydryl phenyl]-α-morpholine acetone (MMMP) and benzoyl formiate etc. for benzophenone, benzoin, benzil derivant.
The example of reactive diluent that is applicable to the light-cured resin of the object of the invention includes but not limited to: methacrylic acid-beta-hydroxy ethyl ester (HEMA), isobornyl acrylate (BOA), lauric acid methacrylate (LMA), 1,6 hexanediol diacrylate, two/tripropylene glycol diacrylate (TPGDA), trimethylolpropane triacrylate (TMPTA), tetramethylol methane tetraacrylate (PET4A) etc.
" nano-functional material " herein is meant that the characteristic because of its scattering of light that has, refraction or absorption aspect can be used in the optical property inorganic material of imaging performance especially of regulating light scattering layer.
Be applicable to that nano-functional material of the present invention can be inorganic nano material or the organic nano material that can regulate light scattering, this nano-functional material mainly is stable metal or nonmetal oxide and salt, includes but not limited to nano silicon-based oxide SiO
2-x, nano aluminium oxide, nano zine oxide, nano zircite, nano lanthanum oxide, nano-titanium oxide, nano-cerium oxide, nanometer barium compound (baryta or barium sulphate), nano yttrium oxide or its potpourri, preferably include nano silicon-based oxide SiO
2-xThis nano-functional material particle diameter can be for below the 100nm, 10-90nm for example, 20-80nm, or 25-90nm, preferred 20-60nm, more preferably 20-40nm.
The present inventor finds that high specific surface area is for example greater than 600m
2/ g, be preferably greater than 650m
2/ g, more preferably greater than 700m
2/ g, favourable to realizing the objective of the invention is, come the composition that is used for optical imagery of the present invention with such composition, can obtain brightness very preferably, and help weakening more even avoid " solar effect ".When using nano silicon-based oxide, chemical formula SiO
2-xMiddle x value is between 0.2-1, and particle diameter is preferably 20-80nm below 100 nanometers, more preferably 20-60nm, most preferably 20-40nm.Nanoparticle of the prior art also can be used for the present invention.In order to increase combining of nano-functional material and resin material, can use existing surfactant or coupling agent (for example silane coupling agent) that the particulate of nano-functional material is carried out surface treatment.
In the present invention, the contrast adjustment material is mainly nano inorganic pigment or dyestuff, it is selected from the group that, ultramarine blue black, Prussian blue by nickel oxide, chrome black, iron oxide black, cobalt black, graphite, carbon black, black micaceous iron-ore, nigrosine, anthraquinone, cobalt blue, copper phthalein indigo plant and indanthrone constitute, be preferably nano inorganic pigment, as nickel oxide, chrome black, iron oxide black, cobalt black, graphite, carbon black, black micaceous iron-ore, carbon black most preferably, its particle diameter is preferably less than 60 nanometers, most preferably less than 40 nanometers.Generally use black pigment, for example carbon black.Also can use other dark dye or pigment, for example brown, dark-brown, blueness, redness etc. as required.
At the composition that is used for forming by casting the individual layer rear projection screen of the present invention, the consumption of nano-functional material is the 0.2-10% of resin material weight, preferred 0.5-5%, more preferably 0.8-2%; The consumption of nano inorganic pigment or organic dyestuff is the 0.03-0.1 ‰ of resin material weight.The fundamental purpose of using it is to increase contrast, and its consumption can be adjusted as required.Be used for resin material of the present invention and be generally colourless transparent material, in some cases, some resin material or wherein used adjuvant have color, if have transparency preferably at this resin material, coloured resin also can use, and the consumption that at this moment can reduce the contrast adjustment material does not even use nano inorganic pigment or dyestuff.
At the composition that is used for forming the individual layer rear projection screen of the present invention, comprise adjuvant commonly used in the resin alternatively, but adjuvant can not influence the transparency of resin by casting.
According to a second aspect of the invention, provide a kind of method of producing the integral back projection type screen, may further comprise the steps by the casting mode:
1) be provided for forming the composition of monoblock type individual layer rear projection screen by casting, said composition comprises: resin material, and as the matrix that is used to hold nano-functional material, described resin material is liquid before curing; Nano-functional material, particle diameter are in the scope of 1-100nm, and consumption is the 0.2-10% of resin material weight; Nano inorganic pigment or organic dyestuff, it is selected from the group that is made of dark nano inorganic pigment and dark organic pigment or dyestuff, and particle diameter is less than 100 nanometers, and consumption is the 0.03-0.1 ‰ of resin material weight;
2) provide first template and second template to make mould, described first template has writing board shape, and described second template has the depressed part of Fresnel Lenses shape;
3) submarginal part is provided with sept and combination between described first template and second template, carries out at least three face seals with encapsulant, forms the mould with the cavity that is used to hold composition;
4) described composition is injected in the described mould;
5) solidify described composition, remove mould, obtain the integral back projection type screen.
The used mould of method of the present invention mainly is two templates, and first template has writing board shape, and second template has the depressed part of Fresnel Lenses shape.One side of the screen after the moulding is the plane, and opposite side is a plurality of trapezoidal annulus of Fresnel Lenses part.Alternatively, first template can also be provided with a cavity that is communicated with the depressed part of second template to increase the thickness of screen, this cavity has flat bottom surface, and the depressed part of such second template is communicated with the cavity that is used to hold composition that constitutes mould with cavity on first template.First template also can not be provided with cavity, and this first template is an one flat plate like this.The material of first template and second template is selected from glass, metal, plastics, timber or stupalith, preferred glass, plastics, most preferably glass.
Sept between the template can be selected for use and the template identical materials.Sept is generally strip, so that in the marginal portion two templates are separated certain distance (corresponding to the thickness of screen).Usually, for square screen, the sept of strip connects into U-shaped, and the downside between two templates and the left and right sides are carried out three face seals (upside is used for casting composition).Encapsulant be for sept and formwork seal in case composition leak.If sept and template can be combined closely, only need use a small amount of encapsulant to get final product at joint, even do not use independent encapsulant (sept plays a part at interval and sealing simultaneously).
The inside surface of template is preferably handled with release agent, so that separate easily when removing mould, if just can easily separate with cured compositions, does not then need to use release agent under without the situation of release agent.Release agent can be selected release agent commonly used in the macromolecule cast molding for use.Casting gate preferably is arranged on the upside that does not have sealing, goes up or is arranged on simultaneously on two templates but one of also can be arranged in two templates.Alternatively, two templates are sealed on four sides, only reserve casting gate and exhausr port at upside.Optionally, vacuumize (degasification) if desired when casting, can reserve two openings in both sides in template top (top), one is used for casting composition, and another is used to connect vacuum pump.
First template and second template are fixed by jig.When injecting composition, composition is flowed down along the side of template, form bubble to avoid bringing air into.Can adopt heat curing or photocuring (radiation curing) according to used resin during curable resin composition.The method according to this invention also comprises the amount of calculating required transparent resin and takes by weighing the step of the composition of described amount.Composition can vacuumize degasification before injection.
Alternatively, rear projection screen of the present invention also can be made by injection molding technique.In this case, need with the thermoplastic resin material predispersion that matrix material prepares nano-functional material and contrast adjustment material.Then by injection moulding.
According to the present invention, also provide preparation to be used for forming the method for compositions of integral back projection type screen by casting, may further comprise the steps: the first step, weighing, take by weighing a certain amount of resin, quality with resin is that benchmark takes by weighing the 0.2-10% nano-functional material, and the above-mentioned nanoscale contrast adjustment material of 0.03-0.1 ‰.In second step, surface treatment is earlier carried out surface treatment with nano-functional material alternatively, to increase the binding ability of they and resin material; Then treated nano-functional material is joined in 10%～20% the resin of all resins.The 3rd step, carry out dispersion treatment, under high-speed stirred (more than the 1000r/min), potpourri carries out the sand milling dispersion treatment.So-called sand milling is exactly that to add particle diameter in potpourri be that the silica sand of 2-10mm carries out the high speed sanded, make its disperse better evenly.The 4th step, finely dispersed potpourri and remaining resin (approximately total resin 80～90%) to be mixed, high-speed stirred is even, removes silica sand, obtains being used for the composition by the formation monoblock type individual layer rear projection screen of casting.
The gross thickness of the monoblock type individual layer rear projection screen that the present invention cast is at about 2～10mm, preferred 3-8mm.If thickness is lower than 2mm, can consider to adopt other manufacturing process, for example spraying or coating; Thickness there is no need to surpass 10mm generally speaking, if desired, also can make the above individual layer screen of 10mm.Mainly be subjected to the restriction of the template size and the strength of materials according to the size of screen of the present invention.The method according to this invention, the size of screen can be very big, can be up to 3m * 8m or 5m * 5m, in addition bigger, this moment, the size of lira was also scalable.
The invention provides a kind of rear projection screen that has matt effect towards spectators' a side.This rear projection screen need carry out etching or grinding process in advance to the inside surface of plane template when moulding, form matt surface, so that the surface of the final screen that forms also has matt effect.This rear projection screen with matt effect helps rear projection screen to use in bright environment to from the ambient light of watching side slight reflection only being arranged.
In another embodiment, when removing mould, only remove second template, interval insulant and encapsulant, and described first template is connected with described rear projection screen maintenance, make first template become the protection panel 30 of rear projection screen, screen as shown in Figure 3.In this mode, first template must be transparent, preferred glass, and do not use release agent on this template, alternatively, earlier the inside surface of first template is handled with bonding agent, coupling agent or surfactant, to increase the bond strength between this template and the composition.
Because screen provided by the invention is all-in-one-piece, its physical strength height needing to be suitable for the occasion of high strength screen.The present invention also provides a kind of back projection type optical projection system, and it comprises the integral back projection type screen that projector and the method according to this invention are made.
The raw-material manufacturer of specific embodiment
Filmogen:
Polymethylmethacrylate, butyl methacrylate: Bei Jing Ming Yue organic glass company limited
The nanometer diffusion material:
Nano-titanium oxide, nano aluminium oxide, nano zine oxide, nano zircite, nano silicon-based oxide: Haitai Nano Material Co., Ltd., Nanjing
Silane coupling agent: the Shen Da of Beijing Fine Chemical Co., Ltd
The contrast adjustment material:
Goth black dyestuff: the B-56C of Wenzhou Mei Ernuo chemical industry company limited
Carbon black pigment: the huge power chemical industry N330 of company limited in Foochow
Other material adopts the commercially available prod.
Preparation composition (particle diameter of wherein used resin and pigment is all less than 100nm)
The preparation composition: it is standby to get 1000g methyl methacrylate oligomer (abbreviation resin).Quality according to resin takes by weighing the nano aluminium oxide of 1g and the carbon black of 2g nano silicon-based oxide and 0.03g, earlier nano material is added the 0.01g silane coupling agent, high-speed stirred is carried out surface treatment, then with the 1000g resin in the mixed with resin of 150g, in potpourri, add 1/2 volume, particle diameter is the quartz sand particle of 2-10mm, carry out the sand milling dispersion treatment with homo-mixer, stirring rate 1500r/min, mixing time 20min is after nano material is uniformly dispersed, again with potpourri and remaining 850g mixed with resin, high-speed stirred is even, remove silica sand, vacuum stripping obtains composition.Standby.
Make screen:
Get the dull and stereotyped tempered glass of a 750mmX1000mm as first template, wherein the inside surface of this template is through the inferior optical processing of hydrofluoric acid solution corrosion.With another piece same size to have the trapezoidal annulus of Fresnel lens (the about 0.2mm of groove depth) tempered glass staggered relatively as second template and first template, carry out three face seals with the thick glass bar of 3mm as sept between both edges, the a small amount of fluid sealant of seam crossing, template is fixed with jig, form mould with internal cavities.Standby composition is injected in the cavity between the template, and curing molding is removed mould, obtain about 3.2mm thick have a Fresnel lens integral back projection type screen partly.
The performance parameter of this rear projection screen: gain coefficient 1.7, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 40 lines, luminance factor 2.3.
The method of testing of gain coefficient: directly measure with spot meter, utilizing gain coefficient is 2.06 standard jig, at distance screen 80cm place, beating a branch of white light with 1000 lumen projection instrument impinges upon on the target, measure the high-high brightness of target screen with spot meter, measure the high-high brightness of tested screen then with identical method, with target compare calculating get final product the gain coefficient of screen.
Angle of visibility, contrast and luminance factor adopt the method for testing of standard.
The measuring method of sharpness: the testing standard sheet with motion picture screen is measured.The standard test piece of motion picture screen is thrown on the screen at 80cm place through slide projector, and its image is respectively the right lines of 10～50 lines, determines the sharpness of tested screen according to the clearly demand pairs that demonstrate.
Embodiment 2
The preparation composition
The preparation composition: it is standby to get 1000g butyl methacrylate (abbreviation resin).The network that takes by weighing 50g nano zine oxide and 50g nano-titanium oxide and 0.03g according to the quality of resin is black, add the 0.01g silane coupling agent to nano material earlier, high-speed stirred is carried out surface treatment, then with the 1000g resin in the mixed with resin of 100g, in potpourri, add 1/2 volume, particle diameter is the quartz sand particle of 2-10mm, carry out the sand milling dispersion treatment with homo-mixer, stirring rate 1500r/min, mixing time 15min is after nano material is uniformly dispersed, again with potpourri and remaining 900g mixed with resin, high-speed stirred is even, remove silica sand, vacuum stripping obtains composition.Standby.
Make screen: repeat the step of embodiment 1, obtain the thick integral back projection type screen that has the Fresnel lens part of about 5mm.
The performance parameter of this rear projection screen: gain coefficient 1.8, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 30 lines, luminance factor 2.
Embodiment 3
The preparation composition
The preparation composition: it is standby to get 1000g Jia Jibingxisuanyizhi (abbreviation resin).Quality according to resin takes by weighing the 3g nano aluminium oxide, the network of 5g nano silicon-based oxide and 0.03g is black, earlier nano material is added the 0.01g silane coupling agent, high-speed stirred is carried out surface treatment, then with the 1000g resin in the mixed with resin of 180g, with the particle that adds 1/2 volume in the potpourri is the silica sand of 2-10mm, carry out the sand milling dispersion treatment with homo-mixer, stirring rate 2000r/min, mixing time 15min is after nano material is uniformly dispersed, again with potpourri and remaining 820g mixed with resin, high-speed stirred is even, remove silica sand, vacuum stripping obtains composition.Standby.
Make screen: repeat the step of embodiment 1, obtain the thick integral back projection type screen that has the Fresnel lens part of about 3mm.
The performance parameter of this rear projection screen: gain coefficient 2, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 40 lines, luminance factor 2.2.
Embodiment 4
The preparation composition
The preparation composition: it is standby to get 1000g butyl acrylate (abbreviation resin).Quality according to resin takes by weighing the 5g nano silicon-based oxide, the carbon black of 2g nano yttrium oxide 3g and 0.05g, earlier nano material is added the 0.01g silane coupling agent, high-speed stirred is carried out surface treatment, then with the 1000g resin in the mixed with resin of 200g, with the particle that adds 1/2 volume in the potpourri is the silica sand of 2-10mm, carry out sand milling dispersion treatment, stirring rate 1800r/min, mixing time 25min with homo-mixer, after nano material is uniformly dispersed, with potpourri and remaining 800g mixed with resin, high-speed stirred is even again, removes silica sand, vacuum stripping obtains composition.Standby.
Make screen: repeat the step of embodiment 1, obtain the thick integral back projection type screen that has the Fresnel lens part of about 5mm.
The performance parameter of this rear projection screen: gain coefficient 1.6, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 32 lines, luminance factor 2.6.
Embodiment 5
The preparation composition
Preparation composition: repeat the step of embodiment 4, obtain composition.Standby.
Make screen: get the dull and stereotyped tempered glass of a 2000mmX2000mm as first template, wherein the outside surface of this template is through the inferior optical processing of sandblast.With another piece same size to have the trapezoidal annulus of Fresnel lens (the about 0.25mm of groove depth) tempered glass staggered relatively as second template and first template, the inside surface of second template applies release agent, carry out three face seals with the thick glass bar of 5mm as sept between two template edges, the a small amount of fluid sealant of seam crossing, template is fixed with jig, form mould with internal cavities.Standby composition is injected in the cavity between the template, and curing molding is removed second template and sept and encapsulant, makes first template and screen keep being connected and as the protection panel of screen.Like this, obtain having the integral back projection type screen of Fresnel lens part and protection panel.
The performance parameter of this rear projection screen: gain coefficient 1.8, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 34 lines, luminance factor 2.8.
Embodiment 6
The preparation composition: it is standby to get 1000g butyl methacrylate performed polymer (resin).The dyestuff that takes by weighing nano silicon-based oxide 60g and 0.04g according to the quality of resin is goth black, earlier nano material is added 0.25g silane coupling agent high-speed stirred and carry out surface treatment, join then in the transparent resin of 150g, add 1/2 volume to potpourri, particle diameter is the quartz sand particle of 2-10mm, carry out the sand milling dispersion treatment with homo-mixer, stirring rate is at least more than the 1500r/min, mixing time 15～30min, after nano material is uniformly dispersed, potpourri is joined in the remaining 850g resin, high-speed stirred (stirring rate is at least more than the 1500r/min) is even, the composition that obtains mixing, container is inserted vacuum pump, vacuumized 20-50 minute, standby behind the bubble in the taking-up solution.
Each amount of substance is used for explanation among the above embodiment, and more if desired composition then prepares according to the aforementioned proportion one or many when casting.
Make screen: with a 750mm
*The dull and stereotyped tempered glass of 1000mm simultaneously carries out corroding method with a kind of particular solution and carries out inferior optical processing, as template.The template that has the Fresnel lens screw thread and the dull surface of another piece same size is staggered relatively, 3mm thickness at interval between the two, glass bar with 3mm is handled the edge sealing that mould carries out three limits, standby composition is injected in the cavity between the template, traditional casting process according to polymethacrylate resin, through the heating cure moulding, remove two templates, obtain the integral back projection type screen.The characteristics of this screen are, have very high contrast 800: 1, and gain can reach 2.1, sharpness can reach 40 lines to more than, angle of visibility is greater than 120 degree.Substantially there is not solar effect.
Embodiment 7
Repeat the step of embodiment 1, wherein replace methacrylic resin with PE low molecular polymer.Obtain having the integral back projection type screen of Fresnel lens part.
The performance parameter of this rear projection screen: gain coefficient 1.4, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 28 lines, luminance factor 2.1.
Embodiment 8
Repeat the step of embodiment 1, wherein replace methacrylic resin with the polypropylene oligomer.Obtain having the integral back projection type screen of Fresnel lens part.
The performance parameter of this rear projection screen: gain coefficient 1.4, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 38 lines, luminance factor 2.3.
Embodiment 9
Repeat the step of embodiment 1, wherein replace methacrylic resin with polycarbonate.Obtain having the integral back projection type screen of Fresnel lens part.
The performance parameter of this rear projection screen: gain coefficient 1.8, angle of visibility is greater than 160 degree, and contrast was greater than 500: 1, and sharpness is right greater than 44 lines, luminance factor 2.8.
Rear projection screen according to the present invention has enough mechanical stabilities, and the articles for washing that screen surface can be general cleans.Rear projection screen according to the present invention has hi-vision stability, the information that spectators can observation post presents in long-time and be difficult for generation visual fatigue.
The method according to this invention can have the jumbotron of glass protection panel, and it has better mechanical strength, and one-shot forming, has simplified production technology, can improve product quality and production efficiency.This is to adopt the prior art institute of substrate pad pasting inaccessiable.
Composition according to the present invention can improve the stability of degree of scatter and composition through the sand milling dispersion treatment.Because Fresnel Lenses part and light scattering part global formation make the manufacture craft of screen simplify the brightness that also can improve screen.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1. an integral back projection type screen (1), by forming with lower member:
Fresnel Lenses part (10) has a plurality of trapezoidal annulus (11), is used for light is pooled directional light, and described trapezoidal annulus is arranged on light source one side;
Light scattering part (20) partly is connected in aggregatesly with described Fresnel Lenses, and described light scattering partly has a plane (21) that is arranged on towards spectators' one side;
Wherein said Fresnel Lenses part is formed by identical resin combination with the light scattering part, and described composition mainly is made of following composition:
Resin material is used to form the matrix that nano-functional material is held in transparent also conduct;
Nano-functional material, particle diameter are less than 100 nanometers, and consumption is the 0.2-10% of resin material weight; And
Nanoscale contrast adjustment material, it is selected from the group that is made of dark nano inorganic pigment and dark organic pigment and dyestuff, and particle diameter is less than 100 nanometers, and consumption is the 0.03-0.1 ‰ of resin material weight.
2. rear projection screen according to claim 1, wherein said resin material are selected from the group of being made up of tygon, polypropylene, Polyvinylchloride, polystyrene, polyalkenylalcohols, poly-(methyl) acrylate, polyamide, polyimide, polyvinyl butyral.
3. rear projection screen according to claim 1, wherein said nano-functional material are selected from the group that is made of silicon-base oxide, aluminium oxide, zirconia, lanthana, titanium dioxide, cerium oxide, tungsten oxide, tantalum oxide, baryta, barium sulphate, yttria or its potpourri.
4. the group that rear projection screen according to claim 1, wherein said contrast adjustment material are selected from is black, Prussian blue by nickel oxide, chrome black, iron oxide black, cobalt black, graphite, carbon black, black micaceous iron-ore, nigrosine, anthraquinone, ultramarine blue, cobalt blue, copper phthalein indigo plant and indanthrone constitute.
5. rear projection screen according to claim 1, wherein said Fresnel Lenses part and light scattering partly form simultaneously by casting or injection technique.
6. rear projection screen according to claim 1, wherein said screen comprise that also a protection panel (30) and the plane towards spectators' one side (21) of described light scattering part (20) link together.
7. method of producing the integral back projection type screen by the casting mode may further comprise the steps:
1) be provided for forming the composition of monoblock type individual layer rear projection screen by casting, said composition comprises: resin material, and as the matrix that is used to hold nano-functional material, described resin material is liquid before curing; Nano-functional material, particle diameter are in the scope of 1-100nm, and consumption is the 0.2-10% of resin material weight; Nanoscale contrast adjustment material, it is selected from the group that is made of dark nano inorganic pigment and dark organic pigment and dyestuff, and particle diameter is less than 100 nanometers, and consumption is the 0.03-0.1 ‰ of resin material weight;
2) provide first template and second template to make mould, described first template has writing board shape, and described second template has the depressed part of Fresnel Lenses shape;
3) submarginal part is provided with sept and combination between described first template and second template, carries out at least three face seals with encapsulant, forms the mould with the cavity that is used to hold composition;
4) described composition is injected in the described mould;
5) solidify described composition, remove mould, obtain the integral back projection type screen.
8. method according to claim 7, wherein said first template and second template are selected from glass, metal, plastics, timber or stupalith.
9. method according to claim 7, described first template and the airtight combination of second template are provided with the composition inlet in the described mould.
10. method according to claim 7 also is included in and injects before the composition step that described first template and/or second template are handled with release agent.
11. method according to claim 7 also is included in the step that vacuumizes before composition injects, so that remove the bubble in the composition fully.
12. method according to claim 7 when injecting composition, makes composition flow down along the side of template, forms bubble to avoid bringing air into.
13. method according to claim 7 adopts heat curing or radiation curing during curable resin composition.
14. method according to claim 7, wherein, the inside surface of described first template or outside surface are through inferior optical processing.
15. method according to claim 14; wherein, when removing mould, remove described second template, sept and encapsulant; and making described first template and described rear projection screen keep being connected, described first template becomes the protection panel of described rear projection screen.
16. a back projection type optical projection system, it comprises projector and the integral back projection type screen of making according to each described method among the claim 7-15.
17. mould that is used for producing the integral back projection type screen by the casting mode, comprise first template and second template, described first template has writing board shape, described second template has the depressed part of Fresnel Lenses shape, described depressed part has a plurality of trapezoidal annulus, by the sept parting seal, form a cavity between the edge of described first template and second template.
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